DAC122S085 Digital-to-Analog Converter Datasheet

DAC122S085 Datasheet, PDF, Equivalent


Part Number

DAC122S085

Description

12-Bit Micro Power DUAL Digital-to-Analog Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download DAC122S085 Datasheet


DAC122S085
DAC122S085
www.ti.com
SNAS361E – MAY 2006 – REVISED MARCH 2013
DAC122S085 12-Bit Micro Power DUAL Digital-to-Analog Converter with Rail-to-Rail
Output
Check for Samples: DAC122S085
FEATURES
1
23 Ensured Monotonicity
• Low Power Operation
• Rail-to-Rail Voltage Output
• Power-on Reset to 0V
• Simultaneous Output Updating
• Wide power supply range (+2.7V to +5.5V)
• Industry's Smallest Package
• Power Down Modes
APPLICATIONS
• Battery-Powered Instruments
• Digital Gain and Offset Adjustment
• Programmable Voltage & Current Sources
• Programmable Attenuators
KEY SPECIFICATIONS
• Resolution: 12 Bits
• INL: ±8 LSB (Max)
• DNL: +0.7 / -0.5
• Settling Time 8.5 µs (Max)
• Zero Code Error: +15 mV (Max)
• Full-Scale Error: -0.75 %FS (Max)
• Supply Power
– Normal: 0.6 mW (3V) / 1.6 mW (5V) (Typ)
– Power Down: 0.3 µW (3V) / 0.8 µW (5V)
(Typ)
DESCRIPTION
The DAC122S085 is a full-featured, general purpose
DUAL 12-bit voltage-output digital-to-analog converter
(DAC) that can operate from a single +2.7V to 5.5V
supply and consumes 0.6 mW at 3V and 1.6 mW at
5V. The DAC122S085 is packaged in 10-lead SON
and VSSOP packages. The 10-lead SON package
makes the DAC122S085 the smallest DUAL DAC in
its class. The on-chip output amplifier allows rail-to-
rail output swing and the three wire serial interface
operates at clock rates up to 40 MHz over the entire
supply voltage range. Competitive devices are limited
to 25 MHz clock rates at supply voltages in the 2.7V
to 3.6V range. The serial interface is compatible with
standard SPI™, QSPI, MICROWIRE and DSP
interfaces.
The reference for the DAC122S085 serves all four
channels and can vary in voltage between 1V and VA,
providing the widest possible output dynamic range.
The DAC122S085 has a 16-bit input shift register that
controls the outputs to be updated, the mode of
operation, the powerdown condition, and the binary
input data. Both outputs can be updated
simultaneously or individually depending on the
setting of the two mode of operation bits.
A power-on reset circuit ensures that the DAC output
powers up to zero volts and remains there until there
is a valid write to the device. A power-down feature
reduces power consumption to less than a microWatt
with three different termination options.
The low power consumption and small packages of
the DAC122S085 make it an excellent choice for use
in battery operated equipment.
The DAC122S085 is one of a family of pin compatible
DACs, including the 8-bit DAC082S085 and the 10-bit
DAC102S085. The DAC122S085 operates over the
extended industrial temperature range of 40°C to
+105°C.
Pin Configuration
VA 1
VOUTA 2
VOUTB 3
NC 4
NC 5
10
9
SON 8
7
6
SCLK
SYNC
DIN
VREFIN
GND
VA
VOUTA
VOUTB
NC
NC
1 10
29
3 VSSOP 8
47
56
SCLK
SYNC
DIN
VREFIN
GND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SPI is a trademark of Motorola, Inc..
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2013, Texas Instruments Incorporated

DAC122S085
DAC122S085
SNAS361E – MAY 2006 – REVISED MARCH 2013
Block Diagram
VREFIN
POWER-ON
RESET
DAC
REGISTER
12
INPUT
CONTROL
LOGIC
REF
12 BIT DAC
12
REF
12 BIT DAC
12
POWER-DOWN
CONTROL
LOGIC
www.ti.com
DAC122S085
BUFFER
VOUTA
BUFFER
2.5k 100k
VOUTB
2.5k 100k
SYNC SCLK DIN
SON
VSSOP
Pin No.
1
2
3
4
5
6
7
8
9
10
11
Symbol
VA
VOUTA
VOUTB
NC
NC
GND
VREFIN
DIN
SYNC
SCLK
PAD
(SON only)
PIN DESCRIPTIONS
Type
Description
Supply
Analog Output
Analog Output
Ground
Analog Input
Digital Input
Digital Input
Digital Input
Ground
Power supply input. Must be decoupled to GND.
Channel A Analog Output Voltage.
Channel B Analog Output Voltage.
Not Connected
Not Connected
Ground reference for all on-chip circuitry.
Unbuffered reference voltage shared by both channels. Must be
decoupled to GND.
Serial Data Input. Data is clocked into the 16-bit shift register on the
falling edges of SCLK after the fall of SYNC.
Frame synchronization input for the data input. When this pin goes low, it
enables the input shift register and data is transferred on the falling edges
of SCLK. The DAC is updated on the 16th clock cycle unless SYNC is
brought high before the 16th clock, in which case the rising edge of
SYNC acts as an interrupt and the write sequence is ignored by the DAC.
Serial Clock Input. Data is clocked into the input shift register on the
falling edges of this pin.
Exposed die attach pad can be connected to ground or left floating.
Soldering the pad to the PCB offers optimal thermal performance and
enhances package self-alignment during reflow.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2 Submit Documentation Feedback
Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: DAC122S085


Features DAC122S085 www.ti.com SNAS361E – MAY 2006 – REVISED MARCH 2013 DAC122S08 5 12-Bit Micro Power DUAL Digital-to-An alog Converter with Rail-to-Rail Output Check for Samples: DAC122S085 FEATURE S 1 •23 Ensured Monotonicity • Low Power Operation • Rail-to-Rail Voltag e Output • Power-on Reset to 0V • S imultaneous Output Updating • Wide po wer supply range (+2.7V to +5.5V) • I ndustry's Smallest Package • Power Do wn Modes APPLICATIONS • Battery-Power ed Instruments • Digital Gain and Off set Adjustment • Programmable Voltage & Current Sources • Programmable Att enuators KEY SPECIFICATIONS • Resolut ion: 12 Bits • INL: ±8 LSB (Max) • DNL: +0.7 / -0.5 • Settling Time 8.5 µs (Max) • Zero Code Error: +15 mV (Max) • Full-Scale Error: -0.75 %FS ( Max) • Supply Power – Normal: 0.6 m W (3V) / 1.6 mW (5V) (Typ) – Power Do wn: 0.3 µW (3V) / 0.8 µW (5V) (Typ) DESCRIPTION The DAC122S085 is a full-fe atured, general purpose DUAL 12-bit voltage-output digital-to-analog converter (DAC) that can operate from a sing.
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